Wako Aoki Haining Li Tadafumi Matsuno Qianfan Xing Yuqin Chen Norbert Christlieb Satoshi Honda Miho N. Ishigaki Jianrong Shi Takuma Suda Nozomu Tominaga Hong-Liang Yan Jingkun Zhao Gang Zhao
The Astrophysical Journal 931(2) 146-146 2022年6月 [査読有り]
Abstract
The chemical abundances of very metal-poor stars provide important constraints on the nucleosynthesis of the first generation of stars and early chemical evolution of the Galaxy. We have obtained high-resolution spectra with the Subaru ...
PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN 74(2) 460-476 2022年4月 [査読有り]
We present our spectroscopic observations of V455 Andromedae during the 2007 superoutburst. Our observations cover this superoutburst from around the optical peak of the outburst to the post-superoutburst stage. During the early superhump phase, t...
Solar flares are often accompanied by filament/prominence eruptions (similar to 10(4) K and similar to 10(10-11) cm(-3)), sometimes leading to coronal mass ejections that directly affect the Earth's environment(1,2). 'Superflares' are found on som...
Young solar-type stars are known to show frequent "superflares," which may severely influence the habitable worlds on young planets via intense radiation and coronal mass ejections. Here we report an optical spectroscopic and photometric observati...
Wako Aoki Timothy C Beers Satoshi Honda Hiroyuki T Ishikawa Tadafumi Matsuno Vinicius M Placco Jinmi Yoon Hiroki Harakawa Teruyuki Hirano Klaus Hodapp Masato Ishizuka Shane Jacobson Takayuki Kotani Tomoyuki Kudo Takashi Kurokawa Masayuki Kuzuhara Jun Nishikawa Masashi Omiya Takuma Serizawa Motohide Tamura Akitoshi Ueda Sébastien Vievard
Publications of the Astronomical Society of Japan 2021年12月 [査読有り]
<jats:title>Abstract</jats:title>
<jats:p>Silicon and strontium are key elements to explore the nucleosynthesis and chemical evolution of the Galaxy by measurements of very metal-poor stars. There are, however, only a few useful spectral lines of...
Yuta Notsu Adam F. Kowalski Hiroyuki Maehara Kosuke Namekata Satoshi Honda Teruaki Enoto Kenji Hamaguchi Isaiah Tristan Suzanne L. Hawley James R. A. Davenport Soshi Okamoto Kai Ikuta Daisaku Nogami Kazunari Shibata
2021年7月
Flares are releases of magnetic energy in the stellar atmosphere, and they have strong emissions from radio to X-rays. During some M dwarf flares, chromospheric line profiles show blue asymmetries, although red asymmetries are more commonly observ...
Solar and stellar flares are caused by the sudden release of magnetic energy on the surfaces. In the case of the Sun, mass ejections often accompany solar flares and affect the Earth’s environment. Active solar-type stars (G-type main-sequence sta...
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